<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>实例4</title>
</head>
<body>
    <div id="app">
        <h1 v-if="isShow">表达式的值为真,就能显示</h1>
    </div>
<script src="https://cdn.jsdelivr.net/npm/vue"></script>
<script>
    var vm = new Vue({
        el: '#app',
        data: {
            isShow: true
        }
    })
</script>
</body>
</html>